“…2,3-Dihydro-3-isobutyryl)-2-(4-oxo-4H-chromen-3-yl)-5- phenyl-1,3,4-oxadiazole (3c). White paper like solid in a yield of 60%, mp 183-184 ° (ethanol); ir (nujol) ν max : 1660, 1635, 1620, 1560 cm -1 ; 1 H, 13 C and COLOC nmr data are presented in 11-H), 7.36-7.41 (m, 2H, (3,5)-H), 7.48-7.52 (m, 1H, 4-H), 7.81-7.84 (m, 2H, (2,6)-H), 9.58 (1 H, s, 8-H), 9.95 (1 H, s, 9-H). EIMS: m/z (%) 206 (100, M + ), 163 (15), 136 (95), 106 (100), 105 (95).…”